ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Oct 13, 2022 (Thursday) 14:00


Ágnes Kóspál (Konkoly Observatory, CSFK, Hungary):
The 2022 outburst of EX Lup - a first look at the disk with the VLT and the 
JWST


EXor-type variables, named after the prototype EX Lupi, are observable 
examples of episodic accretion during star formation. In early 2022, EX Lupi 
unexpectedly went into outburst. Our photometric monitoring suggests that 
this event was much less violent than its extreme eruption in 2008, giving us 
the opportunity to study quantitatively for the first time the effects of a 
moderate accretion burst on the circumstellar disk. With this aim, we 
obtained new ALMA, VLTI/MATISSE, VLT/XSHOOTER, and James Webb Space Telescope 
data for EX Lup in 2022. In this talk, I will show preliminary results of our 
analysis of these data. With ALMA we detected a plethora of molecular lines 
both from complex organic molecules and from simpler species, with 
tantalizing signs of deviations from Keplerian rotation. Accretion tracers at 
optical and near-infrared wavelengths suggest that the accretion rate only 
increased by a factor of few. Nevertheless, MATISSE and JWST revealed that 
even such a moderate outb
 urst could produce detectable amounts of crystalline silicates, which then 
disappeared very quickly. Our JWST spectrum shows the warm molecular content 
of the disk with unprecedented details, from molecules such as CO, H2O, HCN, 
CO2, and C2H2. EX Lup is a good proxy for the proto-Sun and by studying its 
outbursts, we might infer what could have happened during the early evolution 
of the Solar System as well, including chemical and mineralogical effects on 
the material available for planet formation.

The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, The seminar will be held online via Zoom. you can join us via this 
link:
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265





Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/szeminar/szeminarium.shtml